There's no experts, in any field,
just opinionists more or less eloquently speaking..
Often you don't need to ask,
You have already the answer.
Discussion
What about engineering?
It's more about calling someone "expert" between others.. not complaining about expertise itself.
So in case of engineering, there were and will be many cases were "expert" and visionary in engineering failed miserably.
I would come to say, is something like don't teust verify, but of course we still have to delegate somebtrust in others as we can't ourselves expertise in each and every sector, like for example being an engineer and a doctor and a farmer etc etc, at same time.